I’m not perfect anymore. Take the words away… and give me back my skills.
There's compelling proof to suggest that some of Sam 3's stuff originated from a pitch Croteam made for a new Doom game. I'd send you the link but Tumblr doesn't allow me. Google "Serious Sam developer Croteam almost got the rights to make Doom 4." They actually have screenshots of Khnum creeping behind a Doomguy looking fellow and everything.